Why is my Apple ID not working
What does it mean when an error occurs when signing in my Apple ID
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If you can't connect or sign in to iCloud, Apple has a list of things you can try in the document If you can't connect or sign in to iCloud - Apple Support
If you are using a VPN, try turning it off and see if you can then log in. E.g., AppStore - Apple Community
For more assistance try the iCloud Support web site --> iCloud - Official Apple Support
If you still have problems try official Apple Support. Click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> Contact Apple for support and service - Apple Support